<script src="//cdn.bootcss.com/jquery/3.2.1/jquery.js"></script>
<script>
$.ajax({
    url: 'ajax-target.php',
    type: 'POST', //或GET
    async: true,    //或false,是否异步
    data: {
        name:'HQ',
        age:88
    },
    timeout: 5000, //超时时间
    dataType: 'json', //返回的数据格式：json/xml/html/script/jsonp/text
    beforeSend: function(xhr) {
        console.log(xhr);
        console.log('发送前');
    },
    success: function(data, textStatus, jqXHR) {
        console.log(data);
        console.log(textStatus);
        console.log(jqXHR);
    },
    error: function(xhr, textStatus) {
        console.log('错误');
        console.log(xhr);
        console.log(textStatus);
    },
    complete: function() {
        console.log('结束');
    }
});
</script>